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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '9a6215f773fd4f3034199ac93abbaf00f3c30d7ac27e33e28b640bd8baffa6db' 
  AND token = 'jpn6/rYJ1mJyF5WOTmW4QRgVvOefVst7ypIJsQs2fbo=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00025

JSON explain

{
  "query_block": {
    "select_id": 1,
    "message": "no matching row in const table"
  }
}